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Question

A train engine that weighs 5000N stops at the exact centre of a bridge of weighs 75,000N and has two equally spaced pillars to support the bridge. Calculate the force exerted on the ground by a single pillar:

A
75,000N
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B
40,000N
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C
37,500N
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D
2500N
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E
0N
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Solution

The correct option is B 40,000N
The weight of the bridge acts on its center of mass and as the pillars are equidistant from the centre, thus the normal reactions are same by both the pillars.
From figure, 2R=75000+5000 R=40000 N

521367_480666_ans_7dd6f5a229d94a58bdfedf28532ce72d.png

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